The influence of a physician on the smoking of his patients.
D000367:Age Factors; D001291:Attitude of Health Personnel; D004522:Educational Status; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D009790:Occupations; D010414:Pennsylvania; D010817:Physician-Patient Relations; D012737:Sex Factors; D012907:Smoking; D012923:Social Class